Hey, @tcxen 
Thanks for your question! Did you get this worked out?
Can you share your code example here, please? Minus your Private App details 
The code block tool can help with formatting as needed.
Seeing how your code looks, helps our community members to give targeted advice. (You didn’t do anything wrong, I want to increase our surface area for getting an answer for you if possible)
Thanks! — Jaycee